Owners of smart gadgets from the Chinese giant often face a situation when alarming discharge symbols appear on the device screen. For the Mi Body Composition Scale, this can come as a surprise, because smart scales rarely work, but require stable voltage to transfer data over Bluetooth. The question of what battery is in Xiaomi’s scales becomes relevant precisely at the moment when the gadget stops synchronizing with a smartphone or shows incorrect data.
Unlike simple mechanical or cheap electronics, Xiaomi smart scales have a more complex internal architecture, requiring not only power to display numbers, but also power to operate a Bluetooth module and accurate impedansometry sensors. That is why the size and chemical composition of the battery is critical here. A wrong battery can not only quickly sit down, but also damage the contact group.
In this article, we will discuss in detail what current sources are used in various models of the Mi Scale and Mi Body Composition Scale scales. You will learn about the difference between conventional and lithium “pills”, learn how to properly open the compartment without damaging the case and understand why cheap analogues from the supermarket can bring your gadget out of order ahead of time.
⚠️ Warning: Before buying new batteries, be sure to check the labeling on old batteries. Using cells with a different voltage (for example, 1.5V instead of 3V) is guaranteed to break the electronics of the scales.
Basic models of weights and their energy consumption
Xiaomi’s range of weighing devices is extensive, and engineers have used different battery-power solutions across generations. The most popular model for many years has been the Mi Body Composition Scale 2, which has a minimalist design and glass platform, and it’s the model most often found among users asking about power replacements, using an industry-standard format but with important nuances in capacity.
The earlier version, known as the Mi Smart Scale 1 (often white with the "mi" logo in the center), is also based on similar principles, but the design of its battery compartment may differ slightly. Some users confuse these models by trying to open them in the same way, which leads to scratches on the glass or break the latches. It is important to understand that the power consumption in standby mode of these devices is minimal, but peak loads during weighing and transmitting data require stable current.
There are also specialized models, such as the Mi Smart Scale 2 (a simplified version without body composition analysis), that may have a different configuration. However, the vast majority of smart scales that can plot in the Mi Fit or Zepp Life app combine a single power standard, which is made for the convenience of users so that you don't have to look for rare form factors in stores.
It's worth noting that the battery life is directly dependent on the frequency and quality of the Bluetooth connection. If the scales are far from the router or phone, the communication module can work intermittently to find the device, which consumes charge faster. On average, one quality kit is enough for 6-12 months of active operation by a family of 3-4 people.
Type size and chemistry: CR2032 vs. LR2032
When you open the battery compartment, you see a round, flat element that is popularly called a "pill." On the body of almost all Xiaomi scales, it is marked CR2032. It is not just a set of symbols, but a strict technical specification. The letter "C" indicates the chemical composition of lithium-manganese, "R" means round shape, and the number "2032" describes the dimensions: 20 mm in diameter and 3.2 mm in height.
Many users make the mistake of buying batteries labeled LR2032 or simply "2032" without the prefix "CR." The difference lies in chemistry. CR lithium cells have a rated voltage of 3 volts and a stable discharge curve, which is critical for accuracy in weight measurements. Alkaline analogues (often labeled LR) have a voltage of only 1.5 volts. Even if you manage to insert them into the bay (which sometimes requires effort), the scales either won't turn on or won't work properly.
In addition, lithium batteries are better at handling temperature changes and have significantly lower self-discharge when stored, which is important because scales can lie in the bathroom where humidity and temperature can fluctuate. Using cheap alkaline analogues can lead to electrolyte leakage, which will irrevocably damage the contact plates inside the device.
- ✅ CR2032 — Lithium battery, 3V voltage, ideal choice for Xiaomi scales.
- ❌ LR2032 — Alkaline battery, voltage 1.5V, is not suitable for this technique.
- ⚠️ LIR2032 — lithium-ion battery, voltage 3.6-3.7B, could burn the fee.
⚠️ Warning: Never use battery versions (LIR2032) Their increased voltage (3.6V instead of 3V) can disable the device's power controller.
Instructions for replacing the power element
Xiaomi's battery replacement process is technically simple, but requires care and a certain sequence of actions. Careless handling of the glass platform can lead to cracks that will disrupt the integrity of the strain gauges. Before starting the procedure, make sure you have a new CR2032 battery on hand and a small flat screwdriver or coin.
The first step is to turn the scales down with the working surface. The best way to do this is on a soft surface, such as a carpet or a spread towel, so as not to scratch the glass or damage the floor. Find a round battery compartment cover, which is usually located at the bottom of the device, closer to the center or edge, depending on the model.
☑️ Ready for replacement
To open the compartment, you need to turn the lid counterclockwise, and it often has special notches or arrows indicating the direction of rotation (Open/Unlock). Do not put too much effort; if the lid does not open, check if it is stuck due to dirt or factory defects. In rare cases, it may require a thin blade to tuck in the edge, but do it extremely carefully.
Once you remove the lid, you'll see an old battery. Remove it using a plastic tool or nail, trying not to touch the internal contacts with your fingers. The fat from the skin can oxidize the contacts. Insert a new battery while observing polarity: the side with the inscriptions and plus (+) should look up. Make sure that the cell sits tight and does not dangle.
Procedure:
1. Turn the scales over.
2. unscrew the cover (counterclockwise).
3. Remove the old element.
4. Insert a new CR2032 (+ up).
5. Twistle the lid to the click.Close the compartment with the lid firmly pressed and turned clockwise until the characteristic click or matching of marks. Then turn the scales and stand on them to activate the screen. If the scales flashed and showed zeros or asked for synchronization, the procedure was successful.
Comparative table of compatible batteries
There are many manufacturers of batteries on the market, and it is difficult to choose a quality product. Cheap Chinese counterparts can have real capacity 2-3 times lower than claimed, which will lead to the need for frequent replacement. Below is a table with the characteristics of popular brands that have proven themselves in IoT devices.
| Brand | Type | Capacity (mAh) | Storage period | Recommendation |
|---|---|---|---|---|
| Panasonic CR2032 | lithium | 220-240 | 10 years | Tall (Original) |
| Duracell Ultra | lithium | 210-230 | 10 years | Tall. |
| Xiaomi ZMI | lithium | 220 | 5 years | Optimal. |
| NoName (China) | lithium | 80-120 | 2-3 years | Not recommended |
| Energizer | lithium | 225 | 10 years | Tall. |
As you can see from the table, the difference in capacity between branded and cheap cells can be huge. For smart scales that have to run for years without user intervention, the savings of 50 rubles on the battery can come out sideways. Original batteries from Panasonic or Duracell provide stable voltage up to full discharge, while cheap counterparts can abruptly “sink” causing errors in the balance.
Why do scales quickly plant a battery?
Problems and diagnosis after replacement
You may have replaced the battery, but Xiaomi's scales still don't turn on or are acting strangely, and it's a little bit puzzling because the battery is new, but it can be the contacts that are not the battery itself, and the copper contacts, when you're in the bathroom, have a long time, form an oxide film that prevents the flow of current.
To solve this problem, take a cotton swab dipped in alcohol or a special contact cleaner, and gently wipe the contact areas inside the compartment and on the lid. Let the alcohol dry completely before installing a new battery. It is also worth checking whether the spring plate pressing the battery has deformed. If it is too far away, the contact can be unstable.
- 🔍 Libras blink and turn off - most likely poor contact or a defective battery.
- 📱 Libras are turned on but not visible in the app – Bluetooth problem or module discharged (rarely).
- ⚖️ Libra shows the wrong weight – you need calibration or a problem with strain gauges.
If the battery is replaced and the contacts are cleaned, the device may have short-circuited during the previous installation or moisture has entered the body, in which case self-repair is difficult, as it requires dismantling the glass platform and soldering, which often leads to loss of leakage and warranty service.
⚠️ Warning: If you notice signs of corrosion or green plaque inside the battery compartment, do not insert a new battery without thoroughly cleaning the contacts.
Long-term extension advice
To keep your Xiaomi scales long and happy with accurate measurements, it is important not only to choose the right batteries, but also to follow the rules of operation. Smart devices are sensitive to environmental conditions. Despite being protected from moisture, being in the shower cabin or close to steam sources can shorten the life of electronics.
Avoid leaving the scales under direct sunlight. Heating the case can lead to expansion of materials and impaired sealing of the battery compartment. In addition, high temperatures adversely affect the chemical processes inside the lithium cell, accelerating its self-discharge even when the device is turned off.
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Store spare batteries in the fridge? That's a myth! Modern CR2032 lithium batteries are better stored at room temperature in a dry place. The fridge can cause condensation when extracted, which will lead to corrosion.
If you plan to stay off the scale for a long time (e.g., going on vacation for a few months), it makes sense to take out the battery. Although the consumption in sleep mode is minimal, in six months a simple element can discharge to zero and leak, spoiling the device, this is a simple preventive measure that will save your equipment.
Regularly update the firmware of the scales through the application Mi Fit or Zepp Life. Xiaomi engineers periodically release updates that optimize the algorithms of Bluetooth operation and power consumption. The new version of the software can fix bugs that caused excess battery discharge in previous versions.
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Timely battery replacement and contact cleaning is key to the long life of your Xiaomi smart scales. Don’t skimp on batteries, use only lithium CR2032 from proven brands.